"""
is 内存地址
==比较的值
id() -===>内存地址
"""
list1=[1,2,3]
list2=[1,2,3]
list3=list1
print("list1",id(list1))
print("list2",id(list3))
print(list1 is list2)
print(list1 == list3)
# int  -5 ~256
# a=257
# b=257
# print(id(a))
# print(id(b))
# print(a is b)








